I use paralleled dipoles here, and I have limited the number of bands on
a single feedline to 3 bands, so I have one for 20, 15, and 10 meters,
and another for 30, 17, and 12. The wires are spaced about 1 foot apart
with PVC spreaders.
Tuning them is a bit of a challenge, but if one tunes the lowest band
first, and then progresses to the next higher band, it can be done. Do
not try to mix 3rd harmonic bands such as 40 meters and 15 meters, or 80
meters and 30 meters.
I do have a 3rd dual band for 80 and 40, but the radiators are arranged
at right angles to each other so there is little interactions between
those 2 bands.
73,
Don W3FPR
On 9/3/2013 11:35 PM, Charlie T, K3ICH wrote:
I remember trying to tune a four pair parallel wire dipole for 20, 17
, 15 and 10 M. What a bear. Tweak one band and it would screw up the
others. I finally got it tuned, but had to completely replace all the
wires since I had chopped and re-soldered all of them so many times.
I used ½" PVC pipe spreaders which kept the four wires about 2" from
each other. Once up, it would have been impossible to re-deploy due to
tangles.
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